TTHM (Total Trihalomethanes) violations in Arkansas
42 active public water systems in Arkansas had a TTHM (Total Trihalomethanes) violation in the past three years, 3 of them in the latest quarter of EPA's data. What TTHM (Total Trihalomethanes) is and why it matters.
Systems with a TTHM (Total Trihalomethanes) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Subiaco Academy Waterworks Logan County |
250 | 2 | 1 | |
|
Ark State Park MT Magazine Logan County |
142 | 2 | 1 | |
|
Montgomery CO Regional Pwa Montgomery County |
0 | 3 | 0 | |
|
City Corporation Pope County |
29,260 | 1 | 0 | |
|
Conway CO Regional Water Dist Conway County |
21,393 | 2 | 0 | |
|
EL Dorado Waterworks Union County |
17,932 | 1 | 0 | |
|
Prairie Grove Waterworks Washington County |
9,615 | 1 | 0 | |
|
NE Yell County Water Assoc Conway County |
7,198 | 1 | 0 | |
|
Wooster Waterworks Faulkner County |
5,000 | 2 | 1 | |
|
Paris Waterworks Logan County |
4,935 | 1 | 0 | |
|
Beaverfork Pwa Faulkner County |
4,220 | 1 | 0 | |
|
Lee County Water Association Lee County |
3,770 | 3 | 1 | |
|
Mount Ida Waterworks Montgomery County |
3,218 | 3 | 1 | |
|
Tri County Rwdd -Moores Chapel Yell County |
3,112 | 1 | 0 | |
|
Danville Waterworks Yell County |
2,810 | 5 | 2 | |
|
Mansfield Waterworks Sebastian County |
2,367 | 1 | 0 | |
|
Harmony Grove Water Assoc Ouachita County |
2,192 | 2 | 1 | |
|
Hwy 4 24 Water Association Ouachita County |
2,135 | 4 | 1 | |
|
Lake Chicot Water Supply Association Chicot County |
1,909 | 2 | 0 | |
|
Benton County Water Authority5 Benton County |
1,900 | 1 | 0 | |
|
Lakeside Water Association Columbia County |
1,876 | 1 | 0 | |
|
Frenchport Water Association Ouachita County |
1,793 | 2 | 1 | |
|
Mulberry Waterworks Crawford County |
1,648 | 1 | 0 | |
|
Central Logan County Pwfb Logan County |
1,268 | 1 | 0 | |
|
Ola Waterworks Yell County |
1,204 | 3 | 1 | |
|
Casa Water Dept Conway County |
1,153 | 5 | 1 | |
|
Belleville Water Yell County |
1,103 | 2 | 1 | |
|
Dyer Waterworks Crawford County |
1,028 | 2 | 1 | |
|
Ratcliff Waterworks Logan County |
1,019 | 1 | 0 | |
|
Ozan Creek Water System Hempstead County |
787 | 2 | 1 | |
|
Huttig Waterworks Union County |
733 | 2 | 0 | |
|
Greasy Valley Wpfb Logan Co. Logan County |
700 | 2 | 0 | |
|
Chicot Junction Water Assoc Chicot County |
616 | 2 | 0 | |
|
Subiaco City Waterworks Logan County |
548 | 1 | 0 | |
|
Branch Water Works Franklin County |
500 | 1 | 0 | |
|
Oden-Pencil Bluff Water Assn Montgomery County |
393 | 1 | 0 | |
|
Buena Vista-Ogemaw Water Association Ouachita County |
384 | 4 | 0 | |
|
Arkansas City Waterworks Desha County |
360 | 1 | 0 | |
|
Blue Mountain Waterworks Logan County |
357 | 2 | 0 | |
|
Harmony Water Association Union County |
336 | 2 | 0 | |
|
Walnut Hill Water Association Lafayette County |
275 | 1 | 0 | |
|
Moro Waterworks Lee County |
219 | 2 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved TTHM (Total Trihalomethanes), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not TTHM (Total Trihalomethanes) alone.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Arkansas records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.